First post, by ChrisXF
I'm having something of a problem I've never seen before and I wonder if it rings a bell to anyone?
I have an old ISA card based on the Cirrus Logic CL-GD5422 chipset. Card is in good condition and works fine, but it has a home programmed EPROM on it with the original 1.00b BIOS that someone has put on. Fine, but why not upgrade it?
I downloaded a bunch of other BIOS that should be supported by the card but can't get any of them to work. I did find the BIOS as a run and burn .EXE which loads and works great, but none of the BIN files for a more up to date BIOS work with the card: post just beeps like there's no VGA installed.
The EPROM is a 27c256 and works fine, I can erase, program and verify it without issue.
OK, so here's the odd part - when I examine the newer BIN I can read the text in it. CIRRUS LOGIC, etc etc stuff like that. It looks fine (see the pic) but when I pull the BIN out of my current old BIOS chip it looks like a corrupted pile of rubbish. Is it compressed or bit shifted or something?
I've attached a picture to show you what I mean, one looks the part and doesn't work (lower) and the other looks broke and works great (upper)! Lol wut!?
I tested by burning both the good looking bin and the corrupt looking one back to a fresh EPROM, same deal!
I'm sure I've made a daft mistake, but does this ring a bell to anyone who could maybe tell me what I've done wrong?
It would be cool to get this working, as my benchmarks improve with the newer BIOS (loaded from the EXE and I suspect some issues I'm seeing with my TV failing to recognise the signal on VGA might be helped)